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Deciphering Seiko Case Back Information — Plus9Time

Vintage Seiko Quartz Wrist Watch, "7830-5020" Serial Number 811026 33 mm. | eBay

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Deciphering Seiko Case Back Information — Plus9Time

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Vintage Seiko World Time - Decoding Seiko Part Numbers, Model and Serial No

Vintage Seiko World Time - Decoding Seiko Part Numbers, Model and Serial No

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How to tell when your Seiko watch was made (Part 1)

Vintage Seiko Quartz Wrist Watch, 7820-5210 Serial Number 840456. 32 mm Aprox. | eBay

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Deciphering Seiko Case Back Information — Plus9Time

How to tell when your Seiko watch was made (Part 1)

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Seiko Serial Numbers Complete Guide and Date - Millenary Watches

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